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asvenc.c
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1 /*
2  * Copyright (c) 2003 Michael Niedermayer
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * ASUS V1/V2 encoder.
24  */
25 
26 #include "config_components.h"
27 
28 #include "libavutil/attributes.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mem.h"
31 #include "libavutil/mem_internal.h"
32 
33 #include "aandcttab.h"
34 #include "asv.h"
35 #include "avcodec.h"
36 #include "codec_internal.h"
37 #include "encode.h"
38 #include "fdctdsp.h"
39 #include "mpeg12data.h"
40 #include "pixblockdsp.h"
41 #include "put_bits.h"
42 
43 typedef struct ASVEncContext {
44  ASVCommonContext c;
45 
46  PutBitContext pb;
47 
48  void (*get_pixels)(int16_t *restrict block,
49  const uint8_t *pixels,
50  ptrdiff_t stride);
51 
52  PixblockDSPContext pdsp;
53  FDCTDSPContext fdsp;
54  DECLARE_ALIGNED(32, int16_t, block)[6][64];
55  int q_intra_matrix[64];
56 } ASVEncContext;
57 
58 enum {
59  ASV1_MAX_BLOCK_SIZE = 8 + 10 * FFMAX(2 /* skip */, 5 /* ccp */ + 4 * 11 /* level */) + 5,
60  ASV1_MAX_MB_SIZE = 6 * ASV1_MAX_BLOCK_SIZE,
61  ASV2_MAX_BLOCK_SIZE = 4 + 8 + 16 * (6 /* ccp */ + 4 * 13 /* level */),
62  ASV2_MAX_MB_SIZE = 6 * ASV2_MAX_BLOCK_SIZE,
63  MAX_MB_SIZE = (FFMAX(ASV1_MAX_MB_SIZE, ASV2_MAX_MB_SIZE) + 7) / 8
64 };
65 
66 static inline void asv1_put_level(PutBitContext *pb, int level)
67 {
68  unsigned int index = level + 3;
69  unsigned n, code;
70 
71  if (index <= 6) {
72  n = ff_asv_level_tab[index][1];
73  code = ff_asv_level_tab[index][0];
74  } else {
75  n = 3 + 8;
76  code = (0 /* Escape code */ << 8) | (level & 0xFF);
77  }
78  put_bits(pb, n, code);
79 }
80 
81 static inline void asv2_put_level(ASVEncContext *a, PutBitContext *pb, int level)
82 {
83  unsigned int index = level + 31;
84  unsigned n, code;
85 
86  if (index <= 62) {
87  n = ff_asv2_level_tab[index][1];
88  code = ff_asv2_level_tab[index][0];
89  } else {
90  if (level < -128 || level > 127) {
91  av_log(a->c.avctx, AV_LOG_WARNING, "Clipping level %d, increase qscale\n", level);
92  level = av_clip_int8(level);
93  }
94  n = 5 + 8;
95  code = (level & 0xFF) << 5 | /* Escape code */ 0;
96  }
97  put_bits_le(pb, n, code);
98 }
99 
100 static inline void asv1_encode_block(ASVEncContext *a, int16_t block[64])
101 {
102  put_bits(&a->pb, 8, (block[0] + 32) >> 6);
103  block[0] = 0;
104 
105  for (unsigned i = 0, nc_bits = 0, nc_val = 0; i < 10; i++) {
106  const int index = ff_asv_scantab[4 * i];
107  int ccp = 0;
108 
109  if ((block[index + 0] = (block[index + 0] *
110  a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
111  ccp |= 8;
112  if ((block[index + 8] = (block[index + 8] *
113  a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
114  ccp |= 4;
115  if ((block[index + 1] = (block[index + 1] *
116  a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
117  ccp |= 2;
118  if ((block[index + 9] = (block[index + 9] *
119  a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
120  ccp |= 1;
121 
122  if (ccp) {
123  put_bits(&a->pb, nc_bits + ff_asv_ccp_tab[ccp][1],
124  nc_val << ff_asv_ccp_tab[ccp][1] /* Skip */ |
125  ff_asv_ccp_tab[ccp][0]);
126  nc_bits = 0;
127  nc_val = 0;
128 
129  if (ccp & 8)
130  asv1_put_level(&a->pb, block[index + 0]);
131  if (ccp & 4)
132  asv1_put_level(&a->pb, block[index + 8]);
133  if (ccp & 2)
134  asv1_put_level(&a->pb, block[index + 1]);
135  if (ccp & 1)
136  asv1_put_level(&a->pb, block[index + 9]);
137  } else {
138  nc_bits += 2;
139  nc_val = (nc_val << 2) | 2;
140  }
141  }
142  put_bits(&a->pb, 5, 0xF); /* End of block */
143 }
144 
145 static inline void asv2_encode_block(ASVEncContext *a, int16_t block[64])
146 {
147  int i;
148  int count = 0;
149 
150  for (count = 63; count > 3; count--) {
151  const int index = ff_asv_scantab[count];
152  if ((block[index] * a->q_intra_matrix[index] + (1 << 15)) >> 16)
153  break;
154  }
155 
156  count >>= 2;
157 
158  put_bits_le(&a->pb, 4 + 8, count /* 4 bits */ |
159  (/* DC */(block[0] + 32) >> 6) << 4);
160  block[0] = 0;
161 
162  for (i = 0; i <= count; i++) {
163  const int index = ff_asv_scantab[4 * i];
164  int ccp = 0;
165 
166  if ((block[index + 0] = (block[index + 0] *
167  a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
168  ccp |= 8;
169  if ((block[index + 8] = (block[index + 8] *
170  a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
171  ccp |= 4;
172  if ((block[index + 1] = (block[index + 1] *
173  a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
174  ccp |= 2;
175  if ((block[index + 9] = (block[index + 9] *
176  a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
177  ccp |= 1;
178 
179  av_assert2(i || ccp < 8);
180  if (i)
181  put_bits_le(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);
182  else
183  put_bits_le(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);
184 
185  if (ccp) {
186  if (ccp & 8)
187  asv2_put_level(a, &a->pb, block[index + 0]);
188  if (ccp & 4)
189  asv2_put_level(a, &a->pb, block[index + 8]);
190  if (ccp & 2)
191  asv2_put_level(a, &a->pb, block[index + 1]);
192  if (ccp & 1)
193  asv2_put_level(a, &a->pb, block[index + 9]);
194  }
195  }
196 }
197 
198 static inline int encode_mb(ASVEncContext *a, int16_t block[6][64])
199 {
200  int i;
201 
202  av_assert0(put_bytes_left(&a->pb, 0) >= MAX_MB_SIZE);
203 
204  if (a->c.avctx->codec_id == AV_CODEC_ID_ASV1) {
205  for (i = 0; i < 6; i++)
206  asv1_encode_block(a, block[i]);
207  } else {
208  for (i = 0; i < 6; i++) {
209  asv2_encode_block(a, block[i]);
210  }
211  }
212  return 0;
213 }
214 
215 static inline void dct_get(ASVEncContext *a, const AVFrame *frame,
216  int mb_x, int mb_y)
217 {
218  int16_t (*block)[64] = a->block;
219  int linesize = frame->linesize[0];
220  int i;
221 
222  const uint8_t *ptr_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
223  const uint8_t *ptr_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
224  const uint8_t *ptr_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
225 
226  a->get_pixels(block[0], ptr_y, linesize);
227  a->get_pixels(block[1], ptr_y + 8, linesize);
228  a->get_pixels(block[2], ptr_y + 8 * linesize, linesize);
229  a->get_pixels(block[3], ptr_y + 8 * linesize + 8, linesize);
230  for (i = 0; i < 4; i++)
231  a->fdsp.fdct(block[i]);
232 
233  if (!(a->c.avctx->flags & AV_CODEC_FLAG_GRAY)) {
234  a->get_pixels(block[4], ptr_cb, frame->linesize[1]);
235  a->get_pixels(block[5], ptr_cr, frame->linesize[2]);
236  for (i = 4; i < 6; i++)
237  a->fdsp.fdct(block[i]);
238  }
239 }
240 
241 static void handle_partial_mb(ASVEncContext *a, const uint8_t *const data[3],
242  const int linesizes[3],
243  int valid_width, int valid_height)
244 {
245  const int nb_blocks = a->c.avctx->flags & AV_CODEC_FLAG_GRAY ? 4 : 6;
246  static const struct Descriptor {
247  uint8_t x_offset, y_offset;
248  uint8_t component, subsampling;
249  } block_descriptor[] = {
250  { 0, 0, 0, 0 }, { 8, 0, 0, 0 }, { 0, 8, 0, 0 }, { 8, 8, 0, 0 },
251  { 0, 0, 1, 1 }, { 0, 0, 2, 1 },
252  };
253 
254  for (int i = 0; i < nb_blocks; ++i) {
255  const struct Descriptor *const desc = block_descriptor + i;
256  int width_avail = AV_CEIL_RSHIFT(valid_width, desc->subsampling) - desc->x_offset;
257  int height_avail = AV_CEIL_RSHIFT(valid_height, desc->subsampling) - desc->y_offset;
258 
259  if (width_avail <= 0 || height_avail <= 0) {
260  // This block is outside of the visible part; don't replicate pixels,
261  // just zero the block, so that only the dc value will be coded.
262  memset(a->block[i], 0, sizeof(a->block[i]));
263  continue;
264  }
265  width_avail = FFMIN(width_avail, 8);
266  height_avail = FFMIN(height_avail, 8);
267 
268  ptrdiff_t linesize = linesizes[desc->component];
269  const uint8_t *src = data[desc->component] + desc->y_offset * linesize + desc->x_offset;
270  int16_t *block = a->block[i];
271 
272  for (int h = 0;; block += 8, src += linesize) {
273  int16_t last;
274  for (int w = 0; w < width_avail; ++w)
275  last = block[w] = src[w];
276  for (int w = width_avail; w < 8; ++w)
277  block[w] = last;
278  if (++h == height_avail)
279  break;
280  }
281  const int16_t *const last_row = block;
282  for (int h = height_avail; h < 8; ++h) {
283  block += 8;
284  AV_COPY128(block, last_row);
285  }
286 
287  a->fdsp.fdct(a->block[i]);
288  }
289 
290  encode_mb(a, a->block);
291 }
292 
293 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
294  const AVFrame *pict, int *got_packet)
295 {
296  ASVEncContext *const a = avctx->priv_data;
297  const ASVCommonContext *const c = &a->c;
298  int size, ret;
299 
300  ret = ff_alloc_packet(avctx, pkt, c->mb_height * c->mb_width * MAX_MB_SIZE + 3);
301  if (ret < 0)
302  return ret;
303 
304  if (!PIXBLOCKDSP_8BPP_GET_PIXELS_SUPPORTS_UNALIGNED &&
305  ((uintptr_t)pict->data[0] & 7 || pict->linesize[0] & 7 ||
306  (uintptr_t)pict->data[1] & 7 || pict->linesize[1] & 7 ||
307  (uintptr_t)pict->data[2] & 7 || pict->linesize[2] & 7))
308  a->get_pixels = a->pdsp.get_pixels_unaligned;
309  else
310  a->get_pixels = a->pdsp.get_pixels;
311 
312  init_put_bits(&a->pb, pkt->data, pkt->size);
313 
314  for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
315  for (int mb_x = 0; mb_x < c->mb_width2; mb_x++) {
316  dct_get(a, pict, mb_x, mb_y);
317  encode_mb(a, a->block);
318  }
319  }
320 
321  if (avctx->width & 15) {
322  const uint8_t *src[3] = {
323  pict->data[0] + c->mb_width2 * 16,
324  pict->data[1] + c->mb_width2 * 8,
325  pict->data[2] + c->mb_width2 * 8,
326  };
327  int available_width = avctx->width & 15;
328 
329  for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {
330  handle_partial_mb(a, src, pict->linesize, available_width, 16);
331  src[0] += 16 * pict->linesize[0];
332  src[1] += 8 * pict->linesize[1];
333  src[2] += 8 * pict->linesize[2];
334  }
335  }
336 
337  if (avctx->height & 15) {
338  const uint8_t *src[3] = {
339  pict->data[0] + c->mb_height2 * 16 * pict->linesize[0],
340  pict->data[1] + c->mb_height2 * 8 * pict->linesize[1],
341  pict->data[2] + c->mb_height2 * 8 * pict->linesize[2],
342  };
343  int available_height = avctx->height & 15;
344 
345  for (int remaining = avctx->width;; remaining -= 16) {
346  handle_partial_mb(a, src, pict->linesize, remaining, available_height);
347  if (remaining <= 16)
348  break;
349  src[0] += 16;
350  src[1] += 8;
351  src[2] += 8;
352  }
353  }
354 
355  if (avctx->codec_id == AV_CODEC_ID_ASV1)
356  flush_put_bits(&a->pb);
357  else
358  flush_put_bits_le(&a->pb);
359  AV_WN32(put_bits_ptr(&a->pb), 0);
360  size = (put_bytes_output(&a->pb) + 3) / 4;
361 
362  if (avctx->codec_id == AV_CODEC_ID_ASV1) {
363  c->bbdsp.bswap_buf((uint32_t *) pkt->data,
364  (uint32_t *) pkt->data, size);
365  }
366 
367  pkt->size = size * 4;
368  *got_packet = 1;
369 
370  return 0;
371 }
372 
373 static av_cold int encode_init(AVCodecContext *avctx)
374 {
375  ASVEncContext *const a = avctx->priv_data;
376  int i;
377  const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
378  int inv_qscale;
379 
380  ff_asv_common_init(avctx);
381  ff_fdctdsp_init(&a->fdsp, avctx);
382  ff_pixblockdsp_init(&a->pdsp, 8);
383 
384  if (avctx->global_quality <= 0)
385  avctx->global_quality = 4 * FF_QUALITY_SCALE;
386 
387  inv_qscale = (32 * scale * FF_QUALITY_SCALE +
388  avctx->global_quality / 2) / avctx->global_quality;
389 
390  avctx->extradata = av_mallocz(8);
391  if (!avctx->extradata)
392  return AVERROR(ENOMEM);
393  avctx->extradata_size = 8;
394  AV_WL32A(avctx->extradata, inv_qscale);
395  AV_WL32A(avctx->extradata + 4, MKTAG('A', 'S', 'U', 'S'));
396 
397  for (i = 0; i < 64; i++) {
398  if (a->fdsp.fdct == ff_fdct_ifast) {
399  int q = 32LL * scale * ff_mpeg1_default_intra_matrix[i] * ff_aanscales[i];
400  a->q_intra_matrix[i] = (((int64_t)inv_qscale << 30) + q / 2) / q;
401  } else {
402  int q = 32 * scale * ff_mpeg1_default_intra_matrix[i];
403  a->q_intra_matrix[i] = ((inv_qscale << 16) + q / 2) / q;
404  }
405  }
406 
407  return 0;
408 }
409 
410 #if CONFIG_ASV1_ENCODER
411 const FFCodec ff_asv1_encoder = {
412  .p.name = "asv1",
413  CODEC_LONG_NAME("ASUS V1"),
414  .p.type = AVMEDIA_TYPE_VIDEO,
415  .p.id = AV_CODEC_ID_ASV1,
416  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
417  .priv_data_size = sizeof(ASVEncContext),
418  .init = encode_init,
419  FF_CODEC_ENCODE_CB(encode_frame),
420  CODEC_PIXFMTS(AV_PIX_FMT_YUV420P),
421  .color_ranges = AVCOL_RANGE_MPEG,
422 };
423 #endif
424 
425 #if CONFIG_ASV2_ENCODER
426 const FFCodec ff_asv2_encoder = {
427  .p.name = "asv2",
428  CODEC_LONG_NAME("ASUS V2"),
429  .p.type = AVMEDIA_TYPE_VIDEO,
430  .p.id = AV_CODEC_ID_ASV2,
431  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
432  .priv_data_size = sizeof(ASVEncContext),
433  .init = encode_init,
434  FF_CODEC_ENCODE_CB(encode_frame),
435  CODEC_PIXFMTS(AV_PIX_FMT_YUV420P),
436  .color_ranges = AVCOL_RANGE_MPEG,
437 };
438 #endif
CODEC_PIXFMTS
#define CODEC_PIXFMTS(...)
Definition: codec_internal.h:386
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:216
ff_asv_dc_ccp_tab
const uint8_t ff_asv_dc_ccp_tab[8][2]
Definition: asv.c:57
level
uint8_t level
Definition: svq3.c:208
asv1_put_level
static void asv1_put_level(PutBitContext *pb, int level)
Definition: asvenc.c:66
ff_asv_level_tab
const uint8_t ff_asv_level_tab[7][2]
Definition: asv.c:53
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
mem_internal.h
put_bytes_output
static int put_bytes_output(const PutBitContext *s)
Definition: put_bits.h:99
av_clip_int8
#define av_clip_int8
Definition: common.h:109
int64_t
long long int64_t
Definition: coverity.c:34
PIXBLOCKDSP_8BPP_GET_PIXELS_SUPPORTS_UNALIGNED
#define PIXBLOCKDSP_8BPP_GET_PIXELS_SUPPORTS_UNALIGNED
Definition: pixblockdsp.h:25
init_put_bits
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:62
ASV1_MAX_MB_SIZE
@ ASV1_MAX_MB_SIZE
Definition: asvenc.c:60
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:410
put_bits
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:223
w
uint8_t w
Definition: llviddspenc.c:38
FF_QUALITY_SCALE
#define FF_QUALITY_SCALE
Definition: avutil.h:229
AVPacket::data
uint8_t * data
Definition: packet.h:535
encode.h
data
const char data[16]
Definition: mxf.c:149
FFCodec
Definition: codec_internal.h:127
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
ASVEncContext::q_intra_matrix
int q_intra_matrix[64]
Definition: asvenc.c:55
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:431
ff_asv2_level_tab
const uint16_t ff_asv2_level_tab[63][2]
Definition: asv.c:69
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int16_t block[6][64]
Definition: asvenc.c:54
FDCTDSPContext
Definition: fdctdsp.h:28
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
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static void asv1_encode_block(ASVEncContext *a, int16_t block[64])
Definition: asvenc.c:100
ff_asv_scantab
const uint8_t ff_asv_scantab[64]
Definition: asv.c:34
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static void asv2_encode_block(ASVEncContext *a, int16_t block[64])
Definition: asvenc.c:145
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#define FF_CODEC_ENCODE_CB(func)
Definition: codec_internal.h:353
ASV1_MAX_BLOCK_SIZE
@ ASV1_MAX_BLOCK_SIZE
Definition: asvenc.c:59
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static int put_bytes_left(const PutBitContext *s, int round_up)
Definition: put_bits.h:145
ASVCommonContext
Definition: asv.h:34
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Definition: asvenc.c:373
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Definition: movenc.c:60
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const FFCodec ff_asv2_encoder
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Definition: attributes.h:90
ff_asv1_encoder
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int extradata_size
Definition: avcodec.h:515
intreadwrite.h
AVCodecContext::global_quality
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1217
AV_CEIL_RSHIFT
#define AV_CEIL_RSHIFT(a, b)
Definition: common.h:60
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE
This encoder can reorder user opaque values from input AVFrames and return them with corresponding ou...
Definition: codec.h:144
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static int encode_mb(ASVEncContext *a, int16_t block[6][64])
Definition: asvenc.c:198
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#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:41
asv.h
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:73
PutBitContext
Definition: put_bits.h:50
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:326
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:441
ff_asv_ac_ccp_tab
const uint8_t ff_asv_ac_ccp_tab[16][2]
Definition: asv.c:62
PixblockDSPContext
Definition: pixblockdsp.h:28
Descriptor
@ Descriptor
Definition: mxf.h:40
AV_COPY128
#define AV_COPY128(d, s)
Definition: intreadwrite.h:642
aandcttab.h
ASV2_MAX_BLOCK_SIZE
@ ASV2_MAX_BLOCK_SIZE
Definition: asvenc.c:61
handle_partial_mb
static void handle_partial_mb(ASVEncContext *a, const uint8_t *const data[3], const int linesizes[3], int valid_width, int valid_height)
Definition: asvenc.c:241
flush_put_bits_le
static void flush_put_bits_le(PutBitContext *s)
Definition: put_bits.h:174
index
int index
Definition: gxfenc.c:90
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ASV2_MAX_MB_SIZE
@ ASV2_MAX_MB_SIZE
Definition: asvenc.c:62
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AV_CODEC_FLAG_GRAY
#define AV_CODEC_FLAG_GRAY
Only decode/encode grayscale.
Definition: avcodec.h:302
AVPacket::size
int size
Definition: packet.h:536
codec_internal.h
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:104
AV_WN32
#define AV_WN32(p, v)
Definition: intreadwrite.h:372
size
int size
Definition: twinvq_data.h:10344
AV_WL32A
#define AV_WL32A(p, v)
Definition: intreadwrite.h:571
ff_mpeg1_default_intra_matrix
const uint16_t ff_mpeg1_default_intra_matrix[256]
Definition: mpeg12data.c:31
ff_asv_common_init
av_cold void ff_asv_common_init(AVCodecContext *avctx)
Definition: asv.c:91
a
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:41
attributes.h
AV_CODEC_ID_ASV1
@ AV_CODEC_ID_ASV1
Definition: codec_id.h:83
ASVEncContext::fdsp
FDCTDSPContext fdsp
Definition: asvenc.c:53
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:68
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AVCodecContext::extradata
uint8_t * extradata
Out-of-band global headers that may be used by some codecs.
Definition: avcodec.h:514
AV_CODEC_ID_ASV2
@ AV_CODEC_ID_ASV2
Definition: codec_id.h:84
ff_fdctdsp_init
av_cold void ff_fdctdsp_init(FDCTDSPContext *c, AVCodecContext *avctx)
Definition: fdctdsp.c:25
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
fdctdsp.h
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:256
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:179
ASVEncContext::c
ASVCommonContext c
Definition: asvenc.c:44
AVCodecContext::height
int height
Definition: avcodec.h:592
AVCOL_RANGE_MPEG
@ AVCOL_RANGE_MPEG
Narrow or limited range content.
Definition: pixfmt.h:733
encode_frame
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: asvenc.c:293
avcodec.h
stride
#define stride
Definition: h264pred_template.c:536
ff_pixblockdsp_init
av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, int bits_per_raw_sample)
Definition: pixblockdsp.c:87
ASVEncContext::get_pixels
void(* get_pixels)(int16_t *restrict block, const uint8_t *pixels, ptrdiff_t stride)
Definition: asvenc.c:48
ret
ret
Definition: filter_design.txt:187
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
ff_fdct_ifast
void ff_fdct_ifast(int16_t *data)
Definition: jfdctfst.c:207
ASVEncContext
Definition: asvenc.c:43
mpeg12data.h
AVCodecContext
main external API structure.
Definition: avcodec.h:431
put_bits_ptr
static uint8_t * put_bits_ptr(PutBitContext *s)
Return the pointer to the byte where the bitstream writer will put the next bit.
Definition: put_bits.h:402
MAX_MB_SIZE
@ MAX_MB_SIZE
Definition: asvenc.c:63
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:200
mem.h
flush_put_bits
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:153
ff_asv_ccp_tab
const uint8_t ff_asv_ccp_tab[17][2]
Definition: asv.c:45
scale
static void scale(int *out, const int *in, const int w, const int h, const int shift)
Definition: intra.c:273
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:458
AVPacket
This structure stores compressed data.
Definition: packet.h:512
dct_get
static void dct_get(ASVEncContext *a, const AVFrame *frame, int mb_x, int mb_y)
Definition: asvenc.c:215
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:592
ASVEncContext::pb
PutBitContext pb
Definition: asvenc.c:46
ASVEncContext::pdsp
PixblockDSPContext pdsp
Definition: asvenc.c:52
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:455
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
put_bits_le
static void put_bits_le(PutBitContext *s, int n, BitBuf value)
Definition: put_bits.h:263
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
h
h
Definition: vp9dsp_template.c:2070
asv2_put_level
static void asv2_put_level(ASVEncContext *a, PutBitContext *pb, int level)
Definition: asvenc.c:81
put_bits.h
ff_alloc_packet
int ff_alloc_packet(AVCodecContext *avctx, AVPacket *avpkt, int64_t size)
Check AVPacket size and allocate data.
Definition: encode.c:62
src
#define src
Definition: vp8dsp.c:248
pixblockdsp.h
ff_aanscales
const uint16_t ff_aanscales[64]
Definition: aandcttab.c:26
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